Hi Bernard Rose, Thanks for posting in HCM. I understand your concern. Carvedilol is a beta-blocker, which is used to treat heart failure and hypertension (high blood pressure). The 3rd pill you have taken could cause some of the side effects, which you need to be watchful. The blood pressure readings is little lower than normal. If otherwise normal, increase your fluid intake and keep your foot end elevated. Check your blood pressure readings every two hours and it must show increasing trend. You need to seek medical assistance in case you show the following overdose symptoms like uneven heartbeats, shortness of breath, bluish-colored fingernails, dizziness, weakness, fainting, and convulsions. Hope the information provided would be helpful. All the best.